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Vulnerability · Published Sep 2, 2026 · Assigned by redhat

CVE-2026-66786Submariner: submariner: ipsec.conf stanza injection via remote-supplied cablename and subnets

Critical 9.1

In plain English

A critical-severity code injection in Red Hat Advanced Cluster Management for Kubernetes 2 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 72% of all known vulnerabilities).

Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)1.4%top 27.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in submariner. In cert-auth mode, the connection configuration is built using free-form strings from the Custom Resource Definition (CRD) without proper validation. A malicious cluster can exploit this by publishing a CableName that includes newlines and ipsec.conf directives. This allows an attacker to inject arbitrary configuration parameters or execute commands through leftupdown hooks, leading to remote code execution as root on the gateway node.

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 see references

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

References